I have a nagging buttock pain on the left side. I remember (about 3 months ago) chasing a frisbee and my leg jammed and I felt a sudden pain in the area. I am quite active and it has been an ongoing hinderance. One very noticeable syptom is it especially hurts when I am taking my shoe off and using my other foot to push against the heel of the injured left side and I have a very hard time (painful) trying to straighten the leg in certain yoga postures (one legged). I am wondering if it is an upper hamstring pull or something else. Apprecaite any feedback..